Mixture of postchlorinated atactic and eutactic polyvinylchlorides



United States Patent 3 328 490 MIXTURE 0F POSTl'JHI JORINATED ATACTICAND EUTACTIC POLYVINYLCHLORIDES Robert Buning, Oberlar, Karl-HeinzDiesse], Troisdorf,

about 30% of postchlorinated eutactic polyvinylchloride has been mixed.

The plastic mixtures can be worked by the conventional methods, and alsowith the addition of the conventional a d H .E ]d Konermann and BernhardKmemer, 5 working adjuvants such as thermal stabilizers and lubri-Oberlar, Germany, assignors to Dynamit Nobel A.G., Cents, as well aswith the addition of pigments and fillers.

Cologne, G a y, a Corporation of Germany Molded bodies, sheets,filaments or the like can be made Filed D 1964, Sen 416,975 havingadvantageous properties derived from those of the Claims priority,application Germany, Dec. 7, 1963, plastic mixtures 43 121 4 Claims. f260 899) 10 The followmg examples are given in order to more clearlydisclose the nature of the present invention. It

This invention relates to plastic mixtures on a basis should beunderstood, however, that the example is not of posltchlorinated atacticpolyvinylchloride. More parintended to be a limitation on the scope ofthe invention. ticu ar y, it relates to plastic mixtures ofpostchlorinated atactic polyvinylchloride and postchlorinated eutacticl5 Star'tmg mammals polyvinylchloride. The invention is also concernedwith Postohlofinated ataotic P y y chloride was P a method of reducingthe brittleness of postchlorinated Parod y the Chlorination ofSuspension Polyvinyl chloride polyvinylchloride, (prepared at +55 C.with peroxide catalysts, dryblend Broadly considered, the inventioninvolves composiyp The chlorination Was conducted in aqueous tions ofthe above'mentioned nature which contain as two 20 With ChlOIOfOIm asthe Swelling agent, and using of their constituents postchlorinatedatactic polyvinylultraviolet lightchloride and postchlorinated eutacticpolyvinylchloride. Postchlorinated eutactic Polyvinyl chloride was It iswell known that postchlorinated polyvinylchloride ufactured by ananalogous procedure but using eutactic is a relatively brittle plastic.Numerous proposals have P y y ohlofide- The Production of eutactic P y ybeen advanced for reducing the brittleness of postchlo- Chloride canoondnotod, for p according to the rinated polyvinylchloride as, forexample, the addition disclosures of German Anslegeschrlht Numbersthereto of emulsifying agents. The plastics thereby pro- 1,133,130 andFrench Patent 1,261,690 and duced have the disadvantage of a greatlyreduced thermal Japanese Pat n stability. Furthermore, the tensilestrengths of such plas- I Example tics are greatly reduced.

The additives proposed heretofore for improving the 700 PoStFhlonnated'P y" y Was impact strength of postchlorinated polyvinylchloride arethoroughly mixed With 20 hanhnlroadmiilm Steafate, of a chemicallydiiferent structure from that of the postcalcium Stearate, l4 g- E-WaXThe chlorinated polyvinylchloride so that difficulties arise in who wasWorked on a roller miXel' 3 P of 10 the working of the mixtures as, forexample, on the roller 35 mos to'fol'ln a roller Skin- The Still hotSkin Was Pressed mixers, due to poor compatibility. within 3 minutes at190 C. into a 4-mm. thick plate.

Among the objects of the present invention is the pro- Mixtures ofpostchlorinated eutactic polyvinylchloride vision of postchlorinatedpolyvinylchloride compositions With postchlorinated ataoticpolyvinylchloride, a5 hofeiw. h i i properties t those heretofor d dafter set out, were worked in a like manner. The characand sold in themarket. 40 teristics of the resulting products are set out in thefollow- In accordance with the invention it has now been found ingtable:

TABLE 1 Postchlorinated eutactic PVC, percent 100 80 40 30 20 10 9Postchlorinated atactic PVC, percent 0 20 4O 6O 90 100 Tensile strength(kn/cm?) 615 665 670 680 710 690 665 645 Elongation (percent) 2 15 20 5750 29 25 Impact strength (cm. kp lcm At +20 C 17. 3 80.5 N.b. N.b. N.b;N.b. N.b. N.b. At =|=0 o 19. 9 51. 0 80 95 N.b. N.b. N.b. Visual; 5 kg.0.) 109 103 108 107 107 107 107 10s Chlorine content (percent) 62. 163.8

that significantly improved products of postchlorinated 60 It isapparent from the table that the mixtures have polyvinylchloride areobtained by intimately mixing toimproved tensile strengths, elongations,and impact toughgether about 20 to about postchlorinated atactic nesses(particularly at low temperatures) than do the polyvinylchloride(chlorine content between about 58 and individual components. Thethermal stability (Vicat) is about 68%) and about 80 to about 10%post-chlorinated not affected or is afi'ected only slightly. eutacticpolyvinylchloride (chlorine content between 65 The same results inprinciple were obtained on mixing about 58 and about 68%), possibly withother working post-chlorinated atactic polyvinyl chloride with.postadjuvants, such as stabilizers, lubricants, fillers, and thechlorinated eutactic polyvinyl chloride when the latter like. showed agreater difference in their thermal stabilities In accordance with apreferred embodiment of the in- (Vicat). The thermal stabilities of thetwo products add vention, a plastic mixture which is particularlyadapted 7 .to one another in an approximately linear manner under forindustrial purposes consists of postchlorinated atacticpolyvinylchloride with which between about 10% and these conditions. Theresults obtained with such mixtures are summarized in Table 2.

TABLE 2 Postchlorinated eutaetic PVC,

percent 100 30 20 10 Postehlorinated atactic PVC percent 0 7O 80 90 100Tensile strength (kn/em?) 615 680 730 700 665 Elongation (percent). 2 2525 25 25 Impact strength (cm. kp./em.

At +20 C 17.3 N.b. N.b. N.b. N.b. 19. 9 N.b. N.b. N.b. 70 20. 7 N.b.N.b. N.b. 64 N.b. N.b. 120 54 113 117 118 120 Chlorine content 62.1 65.9

In the tables, N.b. signifies not broken, which corresponds to a valuegreater than 150 cm. kp./cm.

The after-chlorinated atactic polyvinyl chloride contains at least 75%1,2-dichloroethylene units. As to the after-chlorinated eutaoticpolyvinyl chloride the chlorine atoms in the eutactic polyvinyl chlorideused for the afterchlorination run along the chain in a 55-85%syndiotactic position.

We claim:

1. A composition of matter comprising about 20 to about 90%post-chlorinated a-tactic polyvinylchloride having a chlorine content ofbetween about 58 and about 68% and about 80 to about postchlorinatedeutactic polyvinylchloride having a chlorine content of between about 58and about 68%.

2. A composition of matter according .to claim 1, comprising 10 to 30%postchlorinated eutaetic polyvinylchloride and 90 to 70% postchlorinatedatactic polyvinylchloride.

3. A composition of matter according to claim 1, additionally containingat least one member selected from References Cited UNITED STATES PATENTS3,167,598 l/l965 Heaps et a1. 260-891 FOREIGN PATENTS 626,843 1/1963Belgium.

MURRAY TILLMAN, Primary Examiner.

J. L. WHITE, Assistant Examiner.

1. A COMPOSITION OF MATTER COMPRISING ABOUT 20 TO ABOUT 90%POSTCHLORINATED ATATCTIC POLYVINLYCHLORDE HAVING A CHLORINE CONTENT OFBETWEEN ABOUT 58 AND ABOUT 68% AND ABOUT 80 TO ABOUT 10% POSTCHLORINATEDEUTACTIC POLYVINYLCHLORIDE HAVING A CHLORINE CONTENT OF BETWEEN ABOUT 58AND ABOUT 68%.